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Here are some shots of the MBR being booted from within
Bochs, which is a PC emulator. Everything up to the
"Booting from Hard Disk" message is just the BIOS starting
up. First, we have the MBR displaying its logo while
waiting to be interrupted before going ahead and booting a
partition.
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If you don't get in quickly enough, it will go ahead and
boot the active partition, which in this case has LILO
installed.
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Pressing SHIFT or CTRL will interrupt the MBR and cause it
to display its prompt.
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Pressing the "F" key will select a floppy boot. I've put
a Grub boot disk in the drive.
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We might instead have pressed the "A" key which goes into
advanced mode. This allows partitions which are not
active to be booted. It even allows empty partitions to
be booted, so be careful.
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